body,html{
  font-weight: 400;
}
@width: 60px;
@height: 60px;
@corner-margin-left: 0px;
@corner-margin-bottom: 155px;
@animationDuriation: .5s;
.menu-center-wrapper{
  position: fixed;
  top: 50%;
  width: @width;
  height: @height;
  transform: 50% 50%;
  z-index: 10000;
}
.menu-left-corner-wrapper{
  position: fixed;
  bottom: @corner-margin-bottom;
  width: @width;
  height: @height;
  z-index: 10000;
}
.menu-right-corner-wrapper{
  position: fixed;
  top: @corner-margin-bottom;
  width: @width;
  height: @height;
  z-index: 10000;
}
